pfunc/pfunc_atomics.h File Reference

Implements atomic operations on PODs. More...

#include <pfunc/config.h>
#include <pfunc/environ.hpp>
#include <stdint.h>
#include <pfunc/asm/x86.h>

Go to the source code of this file.

Defines
#define	PFUNC_STATIC_CAST(T, expr)   (T)(expr)
#define	PFUNC_CONST_CAST(T, expr)   (T)(expr)
#define	PFUNC_DYNAMIC_CAST(T, expr)   (T)(expr)
#define	PFUNC_REINTERPRET_CAST(T, expr)   (T)(expr)
Typedefs
typedef _int32	int32_t
typedef _int16	int16_t
typedef _int8	int8_t
Functions
static PFUNC_INLINE int8_t	pfunc_compare_and_swap_8 (volatile void *dest, int8_t exchg, int8_t comprnd)
	Compare and Swap an 8-bit memory location.
static PFUNC_INLINE int16_t	pfunc_compare_and_swap_16 (volatile void *dest, int16_t exchg, int16_t comprnd)
	Compare and Swap an 16-bit memory location.
static PFUNC_INLINE int32_t	pfunc_compare_and_swap_32 (volatile void *dest, int32_t exchg, int32_t comprnd)
	Compare and Swap an 32-bit memory location.
static PFUNC_INLINE int8_t	pfunc_fetch_and_store_8 (volatile void *location, int8_t new_val)
	Atomically fetches 8-bit value from memory and stores a new value.
static PFUNC_INLINE int16_t	pfunc_fetch_and_store_16 (volatile void *location, int16_t new_val)
	Atomically fetches 16-bit value from memory and stores a new value.
static PFUNC_INLINE int32_t	pfunc_fetch_and_store_32 (volatile void *location, int32_t new_val)
	Atomically fetches 32-bit value from memory and stores a new value.
static PFUNC_INLINE int8_t	pfunc_fetch_and_add_8 (volatile void *location, int8_t addend)
	Atomically fetches 8-bit value from memory and adds to it.
static PFUNC_INLINE int16_t	pfunc_fetch_and_add_16 (volatile void *location, int16_t addend)
	Atomically fetches 16-bit value from memory and adds to it.
static PFUNC_INLINE int32_t	pfunc_fetch_and_add_32 (volatile void *location, int32_t addend)
	Atomically fetches 32-bit value from memory and adds to it.
static PFUNC_INLINE int8_t	pfunc_read_with_fence_8 (volatile void *location)
	Read an 8-bit value and insert a fence after the read.
static PFUNC_INLINE int16_t	pfunc_read_with_fence_16 (volatile void *location)
	Read an 16-bit value and insert a fence after the read.
static PFUNC_INLINE int32_t	pfunc_read_with_fence_32 (volatile void *location)
	Read an 32-bit value and insert a fence after the read.
static PFUNC_INLINE void	pfunc_write_with_fence_8 (volatile void *location, int8_t value)
	Write an 8-bit value and insert a fence before the write.
static PFUNC_INLINE void	pfunc_write_with_fence_16 (volatile void *location, int16_t value)
	Write an 16-bit value and insert a fence before the write.
static PFUNC_INLINE void	pfunc_write_with_fence_32 (volatile void *location, int32_t value)
	Write an 32-bit value and insert a fence before the write.

---

Detailed Description

Implements atomic operations on PODs.

Author:

Prabhanjan Kambadur

---

Define Documentation

#define PFUNC_CONST_CAST	(		T,
			expr
	)		(T)(expr)

#define PFUNC_DYNAMIC_CAST	(		T,
			expr
	)		(T)(expr)

#define PFUNC_REINTERPRET_CAST	(		T,
			expr
	)		(T)(expr)

#define PFUNC_STATIC_CAST	(		T,
			expr
	)		(T)(expr)

---

Typedef Documentation

typedef _int16 int16_t

typedef _int32 int32_t

typedef _int8 int8_t

---

Function Documentation

static PFUNC_INLINE int16_t pfunc_compare_and_swap_16	(	volatile void *	dest,
		int16_t	exchg,
		int16_t	comprnd
	)		[static]

Compare and Swap an 16-bit memory location.

Parameters:

dest	Pointer to the memory location of the operand
exchg	The new value to which dest has to be set if successful
comprnd	The value that is compared to the memory location

 if (*dest == comprnd) {
   *dest = exchg;
   return exchg;
 } else {
   return *dest;
 }  

static PFUNC_INLINE int32_t pfunc_compare_and_swap_32	(	volatile void *	dest,
		int32_t	exchg,
		int32_t	comprnd
	)		[static]

Compare and Swap an 32-bit memory location.

Parameters:

dest	Pointer to the memory location of the operand
exchg	The new value to which dest has to be set if successful
comprnd	The value that is compared to the memory location

 if (*dest == comprnd) {
   *dest = exchg;
   return exchg;
 } else {
   return *dest;
 }  

static PFUNC_INLINE int8_t pfunc_compare_and_swap_8	(	volatile void *	dest,
		int8_t	exchg,
		int8_t	comprnd
	)		[static]

Compare and Swap an 8-bit memory location.

Parameters:

dest	Pointer to the memory location of the operand
exchg	The new value to which dest has to be set if successful
comprnd	The value that is compared to the memory location

 if (*dest == comprnd) {
   *dest = exchg;
   return exchg;
 } else {
   return *dest;
 }  

static PFUNC_INLINE int16_t pfunc_fetch_and_add_16	(	volatile void *	location,
		int16_t	addend
	)		[static]

Atomically fetches 16-bit value from memory and adds to it.

Parameters:

location	Pointer to memory location
addend	The increment to the memory location.

 result = *location;
 *location += addend;
 return result;

static PFUNC_INLINE int32_t pfunc_fetch_and_add_32	(	volatile void *	location,
		int32_t	addend
	)		[static]

Atomically fetches 32-bit value from memory and adds to it.

Parameters:

location	Pointer to memory location
addend	The increment to the memory location.

 result = *location;
 *location += addend;
 return result;

static PFUNC_INLINE int8_t pfunc_fetch_and_add_8	(	volatile void *	location,
		int8_t	addend
	)		[static]

Atomically fetches 8-bit value from memory and adds to it.

Parameters:

location	Pointer to memory location
addend	The increment to the memory location.

 result = *location;
 *location += addend;
 return result;

static PFUNC_INLINE int16_t pfunc_fetch_and_store_16	(	volatile void *	location,
		int16_t	new_val
	)		[static]

Atomically fetches 16-bit value from memory and stores a new value.

Parameters:

location	Pointer to memory location
new_val	The new value to be atomically written in

 result = *location;
 *location = new_val;
 return result;

static PFUNC_INLINE int32_t pfunc_fetch_and_store_32	(	volatile void *	location,
		int32_t	new_val
	)		[static]

Atomically fetches 32-bit value from memory and stores a new value.

Parameters:

location	Pointer to memory location
new_val	The new value to be atomically written in

 result = *location;
 *location = new_val;
 return result;

static PFUNC_INLINE int8_t pfunc_fetch_and_store_8	(	volatile void *	location,
		int8_t	new_val
	)		[static]

Atomically fetches 8-bit value from memory and stores a new value.

Parameters:

location	Pointer to memory location
new_val	The new value to be atomically written in

 result = *location;
 *location = new_val;
 return result;

static PFUNC_INLINE int16_t pfunc_read_with_fence_16

(

volatile void *

location

)

[static]

Read an 16-bit value and insert a fence after the read.

Parameters:

location

The memory from which to read

Returns:

Value at location

static PFUNC_INLINE int32_t pfunc_read_with_fence_32

(

volatile void *

location

)

[static]

Read an 32-bit value and insert a fence after the read.

Parameters:

location

The memory from which to read

Returns:

Value at location

static PFUNC_INLINE int8_t pfunc_read_with_fence_8

(

volatile void *

location

)

[static]

Read an 8-bit value and insert a fence after the read.

Parameters:

location

The memory from which to read

Returns:

Value at location

static PFUNC_INLINE void pfunc_write_with_fence_16	(	volatile void *	location,
		int16_t	value
	)		[static]

Write an 16-bit value and insert a fence before the write.

Parameters:

location	The memory to write to
value	The value to write

static PFUNC_INLINE void pfunc_write_with_fence_32	(	volatile void *	location,
		int32_t	value
	)		[static]

Write an 32-bit value and insert a fence before the write.

Parameters:

location	The memory to write to
value	The value to write

static PFUNC_INLINE void pfunc_write_with_fence_8	(	volatile void *	location,
		int8_t	value
	)		[static]

Write an 8-bit value and insert a fence before the write.

Parameters:

location	The memory to write to
value	The value to write